There is no GUI option to reindex, and I don’t know how you’d run it via bitcoin-cli with Umbrel. But there was a similar question to this here: Command for Reindex Blockchain
No, since your block-storage is unique, the verification need to be done by your own system on your own.
Believe me, a daily snapshot of a 1TB is not something you want your system to go through. What I would rather suggest: Once your block is in sync again, stop bitcoind, copy the whole folder with rsync (see the equivalent for Raspibolt here to another SSD on your computer (don’t attach another SSD to your umbrel, it does not have enough power) via network and put it to a shelf.
Whenever your SSD is toast in the future, you don’t need to do the full IBD, but start from where you did the last transfer. It’s probably always going to be a lot faster than a reindex or complete SSD crash. Those happen more often than you’d want to.